increasing As mobility with soil dilution is seen. It is remarkable the
toxicity of leachates fromS5, to both algae and daphnia, despite the concentration
of trace elements in this soil and its leachateswas the lowest.
As indicated above, in the algal assay, inhibitory effects could result from
the lowconcentration of nutrients in the leachates fromsoil 5 compared
to those of control soil.